package com.tanie.fenxiao.filter;

import com.tanie.fenxiao.entities.Admin;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class AdminLoginFilter implements Filter {
	public void destroy() {
	}

	public void doFilter(ServletRequest req, ServletResponse res,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest) req;
		HttpServletResponse response = (HttpServletResponse) res;
		HttpSession session = request.getSession();
		Admin loginAdmin = null;
		//判断session中的存储的登录名密码和现在登录名密码是否一致
		if (!"".equals(session.getAttribute("loginAdmin"))) {
			loginAdmin = (Admin) session.getAttribute("loginAdmin");
		}
		if ((loginAdmin == null) || (loginAdmin.getId() == null))
			//如果为空重定向到后台首页重新登录
			response.sendRedirect(request.getContextPath() + "/adminLogin");
		else
			chain.doFilter(request, response);
	}

	public void init(FilterConfig arg0) throws ServletException {
	}
}
